There are 10 total arm augmentations available in-game, split into 2 separate augmentation trees. 8 augmentations upgrade Adam's actual cybernetic arms, which increase his overall strength and inventory capacity. The other two upgrade the arm's stabilization which help with aiming the currently equipped firearm.

Editorial Note: The Wall Punch upgrade allows Adam to automatically kill anyone who is on the other side of a wall being breached. Needless to say, this instantly negates your Pacifist achievement/trophy unless you load your game from an earlier point in time.